Portland
The tables below display average monthly climate and weather indicators in Portland Maine.
Temperature by: Fahrenheit / Centigrade
| Portland Temperature |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Avg. Temperature | 4.2 | 6.4 | 8.5 | 10.6 | 13.9 | 17.5 | 20.1 | 20.3 | 17.4 | 12.5 | 7.8 | 4.6 | 12.0 |
| Avg. Max Temperature | 7.4 | 10.6 | 13.3 | 15.9 | 19.5 | 23.3 | 26.6 | 26.8 | 23.7 | 17.8 | 11.4 | 7.6 | 17.0 |
| Avg. Min Temperature | 0.9 | 2.3 | 3.7 | 5.2 | 8.3 | 11.6 | 13.6 | 13.8 | 11.1 | 7.2 | 4.2 | 1.6 | 6.9 |
| Days with Max Temp of 32 C or Higher | 0.0 | 0.0 | 0.0 | 0.0 | < 0.5 | 1.0 | 4.0 | 4.0 | 2.0 | 0.0 | 0.0 | 0.0 | 11.0 |
| Days with Min Temp Below Freezing | 13.0 | 8.0 | 4.0 | 1.0 | 2.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 5.0 | 9.0 | 41.0 |
| |
|
| Portland Heating and Cooling |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Heating Degree Days | 787 | 599 | 549 | 420 | 249 | 91.0 | 28.0 | 35.0 | 102 | 326 | 567 | 769 | 4522 |
| Cooling Degree Days | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 46.0 | 127 | 147 | 51.0 | 0.0 | 0.0 | 0.0 | 371 |
| |
|
| Portland Precipitation |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Precipitation (inches) | 5.4 | 3.9 | 3.6 | 2.4 | 2.1 | 1.5 | 0.6 | 1.1 | 1.8 | 2.7 | 5.3 | 6.1 | 36.3 |
| Days with Precipitation 0.01 inch or More | 18.0 | 16.0 | 17.0 | 14.0 | 12.0 | 9.0 | 4.0 | 5.0 | 8.0 | 12.0 | 18.0 | 19.0 | 152 |
| Monthly Snowfall (inches) | 3.2 | 1.1 | 0.4 | 3.0 | 0.0 | 0.0 | 0.0 | 0.0 | < 0.05 | 0.0 | 0.4 | 1.4 | 6.5 |
| |
|
| Other Portland Weather Indicators |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Average Wind Speed | 10.0 | 9.2 | 8.3 | 7.4 | 7.1 | 7.2 | 7.6 | 7.1 | 6.5 | 6.5 | 8.6 | 9.6 | 7.9 |
| Clear Days | 3.0 | 3.0 | 3.0 | 3.0 | 5.0 | 6.0 | 13.0 | 11.0 | 10.0 | 5.0 | 3.0 | 2.0 | 68.0 |
| Partly Cloudy Days | 4.0 | 4.0 | 5.0 | 6.0 | 7.0 | 8.0 | 8.0 | 10.0 | 8.0 | 8.0 | 4.0 | 3.0 | 74.0 |
| Cloudy Days | 24.0 | 21.0 | 23.0 | 21.0 | 19.0 | 16.0 | 10.0 | 10.0 | 12.0 | 18.0 | 23.0 | 26.0 | 222 |
| Percent of Possible Sunshine | 28.0 | 38.0 | 48.0 | 52.0 | 57.0 | 56.0 | 69.0 | 66.0 | 62.0 | 44.0 | 28.0 | 23.0 | 48.0 |
| Avg. Relative Humidity | 71.5 | 80.0 | 76.0 | 73.0 | 70.0 | 68.0 | 65.5 | 64.0 | 65.5 | 69.0 | 75.0 | 80.0 | 81.5 |
Weather information for other cities in Maine